Reclaimed Waste Water for Power Plant Cooling Tower Water & Boiler Feed Make-up. Richard Coniglio, Business Product Manager
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1 Reclaimed Waste Water for Power Plant Cooling Tower Water & Boiler Feed Make-up Richard Coniglio, Business Product Manager
2 70% Covered with Water 3% is Fresh Water 1% of the Fresh Water is only accessible. Source: U.S. Dept. Of Energy
3 Daily Freshwater Withdrawal Has increased from 341 BGPD in 1995 to 400 BGPD in % 13% Public Supply Irrigation 38% 39% Thermoelectric Power Generation Other Industrial & Commercial Use Source: USGS
4 Water Source Sub Surface Water Surface Water Recovered Water Deep Borehole Shallow Borehole River Water Storage Reservoir Sea Water Blow Down Water Process Water Treated Sewage
5 Available Secondary Treated Municipal Waste Water From Publically Owned Treatment Works (POTW) 1- Within 10 Miles Radius from the Power Plants: 50% of ALL Existing Power Plants 80% of ALL Proposed New Power Plants 2- Within 25 Miles Radius from the Power Plants: 75% of ALL Existing Power Plants 97% of ALL Proposed New Power Plants Source: University of Pittsburgh Study for U.S. Dept. of Energy
6 Wastewater Treatment Core Technologies Sedimentation Filtration Aeration Flotation Biological Treatment Systems Chemical Treatment Systems Disinfection System
7 MBR Process What is a membrane bioreactor? A membrane bioreactor is a state of the art wastewater treatment process utilising biological treatment alongside filtration all in one common tank.
8 MBR Process How does it work? Filtration Process Barrier filtration Membranes Separates solids and liquids Biological Process Activated sludge (MLSS) Bacteria Oxidises organic constituents, BOD, and Nitrification of Ammonia to Nitrate Membrane + Bioreactor
9 Process Design Filtration Multimedia Filtration Micro Filtration Ultra Filtration Activated Carbon Filtration Precoat Filtration
10 MembraneTechnologies September 10, 2010
11 What UF removes Ultrafiltration removes Particles including a portion of colloids like non reactive silica High Molecular Weight species including large organics Pathogens Ultra-filtration does NOT remove Dissolved salts Most dissolved organics Other species like true color, taste & odor etc...
12 Submerged Ultrafiltration Where Used :- RO Pre-treatment Removes fine solids > 0.02 µm
13 Pressurised Ultrafiltration
14 Process Design Demineralization Membrane based Reverse Osmosis Electrodeionization Ion Exchange based Softening WAC/SAC WBA/SBA Mixed Bed IX
15 Case Study No MW- CCPP Ankara, Turkey Fresh water is not readily available Municipal waste water treatment plant 6,000 gallon/minute (gpm) SS: mg/l COD: mg/l as O2 NH4-N: 40 mg/l Water is screened and treated before being piped to the plant 1.5 miles away 2 x 3000 gpm Lime softeners, 6 x 1000 gpm open multimedia filtration unit. 5,000 gpm for the cooling tower water make-up.
16 Lime Softening system
17 Open Multi Media Filter
18 Case Study No MW- CCPP Ankara, Turkey 200 gpm is further treated to produce the Boiler Feed water make-up necessary Ultrafiltration, activated Carbon filter, reverse osmosis, mixed bed ion exchange. The produced water quality for the boiler has conductivity <0.08 µs/cm and silica <10 ppb SiO2.
19 Ultra Filtration For Boiler Feed Water
20 Reverse Osmosis for Dissolved Solid Removal
21 Mixed Bed Ion Exchange for Boiler Feedwater
22 Case Study No. 2 Compact Water Treatment Package To Treat Municipal Waste Water For Low Pressure Boiler Make-up Water in Austria
23 Case Study No. 2 Compact Water Treatment Package To Treat Municipal Waste Water For Low Pressure Boiler Make-up Water in Austria 180 gpm of raw water from the neighboring waste water treatment facility was pumped into the plant Ultrafiltration is used to remove particles and colloidal matters down to 0.03 µm R.O. membranes used to remove 99% of the salts and organic maters The quality of water produced includes, conductivity of approximately 50 µs/cm and total hardness of <0.2 mequ/l suitable for the low pressure boiler.
24 Case Study No. 3 Using Treated Waste Water As 85,000 GPD for Cooling Water Make-up Texas Power Plant
25 MBR Process - Package Plants Permeate tank Membrane tank Primary sedimentation tank Balance tank Gravity feed BLE Structural divide Non-structural baffle
26 Case Study No. 3 Using Treated Waste Water As 85,000 GPD for Cooling Water Make-up Texas Power Plant 100,000 Gallon Per Day (gpd) wastewater is supplied into the treatment facility. Headwork : Fine Screening and equalization basin Anoxic Basin: mixed activated sludge Pre-Aeration Basin: To prevent premature fouling of the membranes in the MBR Basin, fine bubble diffusers are used MBR Basin: produce an extremely clean effluent commonly referred to as permeate Chlorine tablet feeder disinfection system for disinfection prior to discharge Final treated 85,000 gallon per day of water suitable for cooling water make up is discharged to the cooling pond
27 Conclusions Sufficient Treated Municipal Waste Water is available in close proximity to Power Stations. Treated Municipal Waste Water is a Good Supply Source for Power Plant Cooling Water and Pure Water for Boiler. Challenges in Using Available Municipal Wastewater are Avoiding Corrosion, Scaling, Bio fouling, Environmental Compliance. Challenges are overcome, using proven technologies and proven processes to reduce Bacteria, Ammonia, Phosphate, Organics, Chloride, TSS, TDS, Pathogens. Maintain proper chemistry to keep phosphorus, Ammonia, Chloride, Sulphate, Chloride, Bacteria low and use On-Line Automatic Tube Cleaning Systems (circulating Balls or Brush & Basket type) to maintain condenser performance.
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